Heroscape Unit Creator improvements

I've added some improvements to the href="/cgi-bin/heroscapeunit">Heroscape Unit Creator, including a
slightly cleaner layout of saved units and most importantly, the
ability to rate user created units. Hopefully this will make finding
the well done ones easier and will make the incomplete/flawed ones go
away. At some other point I hope to add the ability to view and sort
by other parameters, but until then, go
rate some units.